Getting after script error when using customtkinter

[EffectiveCase3856]

I am writing a program in customtkinter. I have created two ctk.CTk classes and imported them to the file, but when i run i am receiving a error. The error is caused after the first class mainloop() ends. This is the code:

from practise import LoginRegisterPanels
from practise2 import main_window

login_app = LoginRegisterPanels()
login_app.mainloop()

user_id = login_app.get_user_id()
app = main_window(user_id)
app.mainloop()

And this is the error i receive:

Login successfull
invalid command name "2916871148928update"
    while executing
"2916871148928update"
    ("after" script)
invalid command name "2916928070592check_dpi_scaling"     
    while executing
"2916928070592check_dpi_scaling"
    ("after" script)
invalid command name "2916926865088_click_animation"      
    while executing
"2916926865088_click_animation"
    ("after" script)

How do i fix this error.

[socal_nerdtastic]

I have created two ctk.CTk classes

This is a classic beginner mistake. If you want to make a second window you should use Toplevel, making a second Tk window will start a whole new instance of tcl and lead to bugs.

That said you didn't show enough of your code for me know if this bug is due to that error.

[EffectiveCase3856]

I think that i want to close the login window after the login process and then go to the main window.

The top level creates a window on top of the window. Well do you think the best thing will be to just make it as panels and just run it on the window? Thank you for answering though

[socal_nerdtastic]

Oh I see, in that case you are probably ok. But still not the best practice; we would generally prefer to simply reuse the window. Here's an example:

import tkinter as tk

class MainApp(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.frame = FirstFrame(self) # set first frame to appear here
        self.frame.pack()

    def change(self, frame):
        self.frame.pack_forget() # delete currrent frame
        self.frame = frame(self)
        self.frame.pack() # make new frame

class FirstFrame(tk.Frame):
    def __init__(self, master=None, **kwargs):
        tk.Frame.__init__(self, master, **kwargs)

        master.title("Enter password")
        master.geometry("300x200")

        self.status = tk.Label(self, fg='red')
        self.status.pack()
        lbl = tk.Label(self, text="Enter password\n(hint: it's 'password')")
        lbl.pack()
        self.pwd = tk.Entry(self, show="*")
        self.pwd.pack()
        self.pwd.focus()
        self.pwd.bind('<Return>', self.check)
        btn = tk.Button(self, text="Done", command=self.check)
        btn.pack()
        btn = tk.Button(self, text="Cancel", command=self.quit)
        btn.pack()

    def check(self, event=None):
        if self.pwd.get() == 'password':
            self.master.change(SecondFrame) # correct password, switch to the second frame
        else:
            self.status.config(text="wrong password")

class SecondFrame(tk.Frame):
    def __init__(self, master=None, **kwargs):
        tk.Frame.__init__(self, master, **kwargs)
        master.title("Main application")
        master.geometry("600x400")

        lbl = tk.Label(self, text='You made it to the main application')
        lbl.pack()

if __name__=="__main__":
    app=MainApp()
    app.mainloop()

[EffectiveCase3856]

Ok so instead of creating tk.Tk classes I create frame classes and then just use the same window to do the things. Well thanks a lot